Lightroom 5: Difficult to zero-out sliders with Wacom pen

With Lightroom 5's cloning tools, I'm now trying to do as much retouching as possible in Lightroom. One thing I'm finding is that, when I use my Wacom Intuous 4 pen (not the mouse), it is very difficult to "zero-out" or reset the sliders to 0 with a double-click action. I can do this reliably with the mouse, but find it very difficult with the pen specifically. I'd love to be able to do this easily with the pen, as I change brush settings constantly while retouching.